Light, Small and fast, and does great job keeping my iPhone charged up

I had been in need of a power pack for some time, and as i was this week on Jury service i needed to keep my phone charged all day every day this past week. So i have had a good chance to test the item for about 7-8days before reviewing.Pack arrives well packaged and is secured in place and protected by bubble wrap so no issues with delivery. The pack appeared to be charged when it arrived but to be sure i left it charging for a couple of hours to be sure. Unit is supplied with a charge cable, although nay standard cable will also work.The unit is very small and light and fits easily in my pocket with my phone without any noticeable weighing down of pockets. There is two USB ports, one being for charging the unit (an input) and one for whatever device you want to charge from with a standard USB (the output). There is a small button on the side that lights up to four blue LEDs showing the amount of charge available and they also flash incrementally when charging the unit so you can see when its done charging up.I have 3-4 times this week ran my iPhone 6 down to about 5-10% battery and plugged into this pack to charge, its charged back up to 100% in about 90min on average, and have got about two charges out of the unit give or take.The unit seems robust, had it either in my pocket or backpack all week and no issues at all yet, only very tiny niggle i found was the USB port (output) was very easy to plug in the incorrect way around and it wouldn't charge, But as soon as you plug it in correctly all is good again.All in all a great unit that keeps my phone going for a long day away from power...NB: I received this unit at a discount (£2 OFF coupon code ETRQFTR6) for a fair and honest review.Link= http://amzn.to/1YXFdKg